关键词: 推覆构造, 滑覆构造, 中—新生代, 江西南城

Abstract:

Based on geological surveying and drilling verification of stratum contact relations both between Jurassic Linshan Group and underlying Pre-Jurassic metamorphic strata and between Cretaceous and Pre-Cretaceous strata, this study has newly found the Xiejia structural window, Zhuyouxincun structural window, Shangwushi structural window and Wangtianshi klippe, and moreover, has determined the Yanshanian glide and Himalayan thrust nappe structures in Nancheng area, Jiangxi. The Yanshanian glide structure occurred in the end of Middle Jurassic along the expanding surface from unconformity surfaces between D-T₂/T₃-K₁ (gliding nappe) and lower strata (underlying strata). The dynamics of glide structures maybe relate to the subduction of Pacific plate from southeast toward northwest. The large-scale Himalayan thrust nappe structure had thoroughly altered the former strata sequence and formed present tectonic framework. This framework is composed of multiple imbricated thrust and stacking faults (bedding and crossbedding) and behaves a feature of lateral zonation and vertical stratification. The allochthon Pre-Cretaceous mass thrusts from southeast toward northwest and stacks on the autochthon Cretaceous strata. The autochthon Cretaceous strata exhibit some windows around by Pre-Cretaceous. The dynamics of Himalayan thrust nappe structure is complicated and maybe relate to the distant effect of the collision between the Eurasian plate and the Indian plate.

Key words: thrust nappe structure, sliding nappe structure, Mesozoic-Cenozoic, Nancheng, Jiangxi